1,721,053 research outputs found
GPCALMA: Implementation in Italian hospitals of a Computer Aided Detection system for breast lesions by mammography examination
No full textImplementation of a Computer Aided Detection system for mammographic lesions with GRID applications
No full text
A CAD system for the detection of mammographic microcalcifications based on Gabor transform
No full textBreast Computed Tomography: CMOS Flat Panel Sensor with monochromatic X-ray
No full textWe mean to estimate the average adsorbed and distributed dose inside the phantoms. Then, we aim to measure the spatial resolution and the contrast resolution of the synchrotron radiation breast CT system. At the end, we would to evaluate how changes the influence of the scattering on the quality image increasing the beam energy of the synchrotron radiation
La Mediprobee e la Medispect
No full textBreve presentazione dei prototipi di scanner SPECT e Fluorescenza per imaging su piccoli animali realizzato presso il Laboratorio di Fisica Medica del Dipartimento di Scienze Fisiche, su progetti finanziati dall'INFN
High resolution 125I SPECT imaging of the mouse thyroid with the MediSPECT scanner
No full textWe present first in vivo tomographic Na125I imaging of the mouse thyroid carried out with the new MediSPECT small animal SPECT scanner, based on a fine pitch CdTe pixel detector (14×14 mm2, 256×256 square pixel of 55 μm side) and equipped with a high resolution collimators set. The MediSPECT scanner is based on a gantry, hosting the collimation and detection units, rotating around a horizontal axis along which is the small animal housing. The mouse was injected with a Na125I solution with a total activity of 31.8 MBq. The planar projections for SPECT reconstruction were acquired with a 300 μm tungsten pinhole (magnification 1.47 and a Field of View — FoV - of 9.6×9.6 mm2). The projections have been captured in a step-and shoot fashion by rotating the detector around the animal holder. To obtain the SPECT image all the projections are elaborated with a C++ software based on ordered subsets-expectation maximization (OS-EM) reconstruction algorithm, developed by our group. Test images for assessing the MediSPECT scanner spatial resolution have been also acquired using phantoms and are also presented in this wok. The measured spatial resolution with a 300 μm pinhole is, in planar imaging, about 500 μm and, in tomographic imaging, better than 900 μm. The modular structure of MediSPECT allows for multimodal imaging: at present, a Fluorescence Reflectance Imaging head has been installed, for planar optical imaging in addition to SPECT imaging
X-ray Cone-Beam Breast Computed Tomography: Phantom Studies on Microcalcifications Visibility
No full textThe purpose of this study is to evaluate the microcalcifications (MCs) detection capability of the BCT (Breast Computed Tomograph) scanner developed at by our group. The studies have been conducted using a breast phantom with MC inclusions simulated by small fragments of egg-shell (dimensions 350÷450 ¿m). The MCs are positioned in a cluster configuration in regions of interest (ROI) with a diameter of about 8 mm at different depths inside the phantom. The better conditions for MCs visibility/detectability have been investigated as a function of the detector pixel size (50, 200 ¿m), at different air Kerma (5, 7.5, 9 mGy) at X-ray tube voltage 80 kV
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